Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
BareMetrics - SaaS Analytics for Stripe
FullContact - Put the power of full contact information into your web or mobile apps.
Stunning - Dunning emails, failed payments, churn prevention, event notifications, custom HTML receipts and more for Stripe subscriptions, with iPhone app and push notifications
Account Dock - Billing history for your Stripe App
LeadGibbon - Access millions of business contacts, with verified email addresses and phone numbers